Conclusive evidence of magnetic rotational band in 57Fe: Extending the shears mechanism to the fp shell orbital

S. Basu; G. Mukherjee; S. Rajbanshi; Y. Utsuno; Noritaka Shimizu; S. Nandi; S. S. Nayak; S. Pal; S. Bhattacharyya; S. Chakraborty; Soumik Bhattacharya; Shabir Dar; Sneha Das; S. Basak; D. Kumar; D. Paul; K. Banerjee; Pratap Roy; S. Manna; Samir Kundu; T. K. Rana; R. Pandey; S. Samanta; S. Chatterjee; R. Raut; S. S. Ghugre; H. Pai; A. Karmakar; S. Chattopadhyay; S. Das Gupta; P. Pallav; R. Banik; S. Ali; Y. M. Wang; Q. B. Chen

doi:10.1016/j.physletb.2025.139642

Conclusive evidence of magnetic rotational band in ⁵⁷Fe: Extending the shears mechanism to the fp shell orbital

S. Basu
, G. Mukherjee^*
, S. Rajbanshi
, Y. Utsuno
, Noritaka Shimizu
, S. Nandi
, S. S. Nayak
, S. Pal
, S. Bhattacharyya
, S. Chakraborty
, Soumik Bhattacharya
, Shabir Dar
, Sneha Das
, S. Basak
, D. Kumar
, D. Paul
, K. Banerjee
, Pratap Roy
, S. Manna
, Samir Kundu

T. K. Rana, R. Pandey, S. Samanta, S. Chatterjee, R. Raut, S. S. Ghugre, H. Pai, A. Karmakar, S. Chattopadhyay, S. Das Gupta, P. Pallav, R. Banik, S. Ali, Y. M. Wang, Q. B. Chen

^*Corresponding author for this work

School of Physics and Electronic Science

Variable Energy Cyclotron Centre
Training School Complex
Homi Bhabha National Institute
Department of Physics
Presidency College India
Advanced Science Research Center
Japan Atomic Energy Agency
Center for Nuclear Study
The University of Tokyo
University of Tsukuba
Nantes Université
Institute of Engineering and Management
University Grant Commission, New Delhi
Department of Physics
Adamas University
Extreme Light Infrastructure
Horia Hulubei National Institute of Physics and Nuclear Engineering
Saha Institute of Nuclear Physics
Victoria Institution (College)
Government General Degree College at Pedong
Department of Physics
East China Normal University

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

A Magnetic Rotational (MR) band in ⁵⁷Fe nucleus has been newly identified and established from the decreasing behaviour of the experimental electric dipole transition probabilities, B(M1), determined from the measured lifetimes of the states. This becomes the first nucleus in the lighter mass (A<60) region in which, the B(M1) values of an MR band are measured. A single-particle configuration of πf_7/2⁻²⊗ν(p_3/2f_5/2p_1/2)³ has been assigned to this MR band. This configuration, which involves only the negative parity proton and neutron orbitals below and above the Z,N = 28 shell closures, respectively, is a unique one which was not identified before for an MR band. The range of observed angular momenta for this band is congruent with this configuration and the experimental data are found to be in agreement with the SPAC (Shears mechanism with Principal Axis Cranking) and semi-classical calculations. Shell model calculations with GXPF1A interaction reproduce the observed levels in ⁵⁷Fe including the band head of the MR band. This validates the assigned configurations of this band.

Original language	English
Article number	139642
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	868
DOIs	https://doi.org/10.1016/j.physletb.2025.139642
State	Published - Sep 2025

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Basu, S., Mukherjee, G., Rajbanshi, S., Utsuno, Y., Shimizu, N., Nandi, S., Nayak, S. S., Pal, S., Bhattacharyya, S., Chakraborty, S., Bhattacharya, S., Dar, S., Das, S., Basak, S., Kumar, D., Paul, D., Banerjee, K., Roy, P., Manna, S., ... Chen, Q. B. (2025). Conclusive evidence of magnetic rotational band in ⁵⁷Fe: Extending the shears mechanism to the fp shell orbital. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 868, Article 139642. https://doi.org/10.1016/j.physletb.2025.139642

@article{7485ecad7630490fa78498e2bc0cb8e7,

title = "Conclusive evidence of magnetic rotational band in 57Fe: Extending the shears mechanism to the fp shell orbital",

abstract = "A Magnetic Rotational (MR) band in 57Fe nucleus has been newly identified and established from the decreasing behaviour of the experimental electric dipole transition probabilities, B(M1), determined from the measured lifetimes of the states. This becomes the first nucleus in the lighter mass (A<60) region in which, the B(M1) values of an MR band are measured. A single-particle configuration of πf7/2−2⊗ν(p3/2f5/2p1/2)3 has been assigned to this MR band. This configuration, which involves only the negative parity proton and neutron orbitals below and above the Z,N = 28 shell closures, respectively, is a unique one which was not identified before for an MR band. The range of observed angular momenta for this band is congruent with this configuration and the experimental data are found to be in agreement with the SPAC (Shears mechanism with Principal Axis Cranking) and semi-classical calculations. Shell model calculations with GXPF1A interaction reproduce the observed levels in 57Fe including the band head of the MR band. This validates the assigned configurations of this band.",

author = "S. Basu and G. Mukherjee and S. Rajbanshi and Y. Utsuno and Noritaka Shimizu and S. Nandi and Nayak, \{S. S.\} and S. Pal and S. Bhattacharyya and S. Chakraborty and Soumik Bhattacharya and Shabir Dar and Sneha Das and S. Basak and D. Kumar and D. Paul and K. Banerjee and Pratap Roy and S. Manna and Samir Kundu and Rana, \{T. K.\} and R. Pandey and S. Samanta and S. Chatterjee and R. Raut and Ghugre, \{S. S.\} and H. Pai and A. Karmakar and S. Chattopadhyay and \{Das Gupta\}, S. and P. Pallav and R. Banik and S. Ali and Wang, \{Y. M.\} and Chen, \{Q. B.\}",

note = "Publisher Copyright: {\textcopyright} 2025 The Author(s)",

year = "2025",

month = sep,

doi = "10.1016/j.physletb.2025.139642",

language = "英语",

volume = "868",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier B.V.",

}

Basu, S, Mukherjee, G, Rajbanshi, S, Utsuno, Y, Shimizu, N, Nandi, S, Nayak, SS, Pal, S, Bhattacharyya, S, Chakraborty, S, Bhattacharya, S, Dar, S, Das, S, Basak, S, Kumar, D, Paul, D, Banerjee, K, Roy, P, Manna, S, Kundu, S, Rana, TK, Pandey, R, Samanta, S, Chatterjee, S, Raut, R, Ghugre, SS, Pai, H, Karmakar, A, Chattopadhyay, S, Das Gupta, S, Pallav, P, Banik, R, Ali, S, Wang, YM & Chen, QB 2025, 'Conclusive evidence of magnetic rotational band in ⁵⁷Fe: Extending the shears mechanism to the fp shell orbital', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 868, 139642. https://doi.org/10.1016/j.physletb.2025.139642

TY - JOUR

T1 - Conclusive evidence of magnetic rotational band in 57Fe

T2 - Extending the shears mechanism to the fp shell orbital

AU - Basu, S.

AU - Mukherjee, G.

AU - Rajbanshi, S.

AU - Utsuno, Y.

AU - Shimizu, Noritaka

AU - Nandi, S.

AU - Nayak, S. S.

AU - Pal, S.

AU - Bhattacharyya, S.

AU - Chakraborty, S.

AU - Bhattacharya, Soumik

AU - Dar, Shabir

AU - Das, Sneha

AU - Basak, S.

AU - Kumar, D.

AU - Paul, D.

AU - Banerjee, K.

AU - Roy, Pratap

AU - Manna, S.

AU - Kundu, Samir

AU - Rana, T. K.

AU - Pandey, R.

AU - Samanta, S.

AU - Chatterjee, S.

AU - Raut, R.

AU - Ghugre, S. S.

AU - Pai, H.

AU - Karmakar, A.

AU - Chattopadhyay, S.

AU - Das Gupta, S.

AU - Pallav, P.

AU - Banik, R.

AU - Ali, S.

AU - Wang, Y. M.

AU - Chen, Q. B.

PY - 2025/9

Y1 - 2025/9

N2 - A Magnetic Rotational (MR) band in 57Fe nucleus has been newly identified and established from the decreasing behaviour of the experimental electric dipole transition probabilities, B(M1), determined from the measured lifetimes of the states. This becomes the first nucleus in the lighter mass (A<60) region in which, the B(M1) values of an MR band are measured. A single-particle configuration of πf7/2−2⊗ν(p3/2f5/2p1/2)3 has been assigned to this MR band. This configuration, which involves only the negative parity proton and neutron orbitals below and above the Z,N = 28 shell closures, respectively, is a unique one which was not identified before for an MR band. The range of observed angular momenta for this band is congruent with this configuration and the experimental data are found to be in agreement with the SPAC (Shears mechanism with Principal Axis Cranking) and semi-classical calculations. Shell model calculations with GXPF1A interaction reproduce the observed levels in 57Fe including the band head of the MR band. This validates the assigned configurations of this band.

AB - A Magnetic Rotational (MR) band in 57Fe nucleus has been newly identified and established from the decreasing behaviour of the experimental electric dipole transition probabilities, B(M1), determined from the measured lifetimes of the states. This becomes the first nucleus in the lighter mass (A<60) region in which, the B(M1) values of an MR band are measured. A single-particle configuration of πf7/2−2⊗ν(p3/2f5/2p1/2)3 has been assigned to this MR band. This configuration, which involves only the negative parity proton and neutron orbitals below and above the Z,N = 28 shell closures, respectively, is a unique one which was not identified before for an MR band. The range of observed angular momenta for this band is congruent with this configuration and the experimental data are found to be in agreement with the SPAC (Shears mechanism with Principal Axis Cranking) and semi-classical calculations. Shell model calculations with GXPF1A interaction reproduce the observed levels in 57Fe including the band head of the MR band. This validates the assigned configurations of this band.

UR - https://www.scopus.com/pages/publications/105007420342

U2 - 10.1016/j.physletb.2025.139642

DO - 10.1016/j.physletb.2025.139642

M3 - 文章

AN - SCOPUS:105007420342

SN - 0370-2693

VL - 868

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

M1 - 139642

ER -

Conclusive evidence of magnetic rotational band in ⁵⁷Fe: Extending the shears mechanism to the fp shell orbital

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